BEYOND S20R-SVXCL16 Boring Bar | CNC Internal Turning Tool Holder
Price shown is a starting point. Contact us for a precise quote based on your requirements.
BEYOND S20R-SVXCL16 Indexable CNC Internal Turning Boring Bar
1. Product Overview
"Which 20mm left-hand indexable boring bar provides optimal flank clearance and high rigidity for intricate internal profiling using 35-degree VCMT or VCGT 1604 inserts?"
The BEYOND S20R-SVXCL16 is a professional-grade, high-rigidity left-hand indexable internal boring bar engineered for demanding profiling, back-boring, and semi-finishing operations on CNC lathes. Vacuum-quenched to optimize its core microstructure and mechanical toughness, this high-mass 20mm diameter tool holder provides exceptional dynamic stability, making it highly effective at neutralizing harmonic vibrations across extended deep-hole overhangs up to 4xD. It is specifically designed to accept standard 35-degree rhombic indexable inserts—such as the VCMT 1604 and VCGT 1604 series. By positioning a 35° diamond profile at a precise 113-degree approach angle, this geometry offers excellent flank clearance, enabling machinists to execute steep internal tapers, deep undercuts, and intricate profiling cuts where standard 55° or 80° bars would experience heel rub. Secured by a highly rigid screw-down clamping mechanism, it ensures optimal pocket positioning under variable chip loads, resulting in superior geometric repeatability and excellent surface finishes.
2. Product Core Advantages (Key Features)
- Premium Vacuum-Heat Treated Alloy Steel (HRC 42-47): Heavy-duty, high-tensile steel shank absorbs harmonic chatter during long-reach internal operations, ensuring dimensional accuracy.
- SVXCL 113-Degree Lead Angle Engineering: Specifically designed for left-hand deep undercutting and reverse profiling. The narrow 35° insert profile allows smooth tracing of intricate contours without tool deflection or dragging.
- Precision-Machined Insert Pocket: Flawlessly micro-milled seating ensures uniform contact along the VCMT/VCGT insert edges, maximizing insert tool life and reducing edge chipping.
- Anti-Wear Matte Black Oxide Skin: Advanced anti-corrosion chemical coating shields the bar from rust, moisture, and chip welding when subjected to high-temperature friction or aggressive water-soluble coolants.
3. Technical Specifications & ISO Nomenclature
| Dimension Attributes | Metric System Specifications | Imperial Equivalent Values |
|---|---|---|
| Model Nomenclature | S20R-SVXCL16 (BEYOND) | A12R-SVXCL3 (Standard Inch Style Equivalent) |
| Shank/Clamping Diameter | 20 mm | 0.787 inch (approx. 3/4" Shank Adaptation) |
| Overall Tool Length | 200 mm | 7.87 inches |
| Minimum Boring Hole (D-min) | 25 mm | 0.984 inch |
| Compatible Indexable Inserts | VCMT 1604** / VCGT 1604** | VCMT 33* / VCGT 33* Series (e.g., 331 or 332) |
| Fastener Screw / Drive Key | M3.5 * 9.0 / Torx T15 | M3.5 * 9.0 / Torx T15 |
Recommended Machining Parameter Array (Starting Parameters)
| Workpiece Material Substrates | Target Line Cutting Speed (Vc) & Feed Speed (f) Pairs |
|---|---|
| Carbon & Alloy Steels (P-Class) | Vc: 140-260 m/min (460-850 sfm) | f: 0.08-0.22 mm/rev (0.003-0.009 ipr) |
| Stainless Steel Alloys (M-Class / 316) | Vc: 100-180 m/min (330-590 sfm) | f: 0.06-0.16 mm/rev (0.0024-0.006 ipr) |
| Aluminum & Copper Alloys (N-Class) | Vc: 200-500 m/min (650-1640 sfm) | f: 0.08-0.28 mm/rev (0.003-0.011 ipr) |
Need premium matching 35-degree VCMT/VCGT inserts or alternative sizes?
Source BEYOND VCMT1604 Inserts & Toolbars Here →4. Industrial Application Scenarios
Combining a sleek 20mm shank with a high-precision 16mm insert pocket, the S20R-SVXCL16 is optimized for modern CNC lathes and turning centers:
- Internal Taper & Contour Profiling: Tracing complex inside curves and tight geometric transitions down to a 25mm entry diameter with zero chatter.
- High-Depth Back-Boring: Reaching past internal shoulder walls to machine rear faces and wide relief undercuts under heavy chip loads in left-handed setups.
- Precision Aerospace & Hydraulic Component Valve Production: Creating fine finishes on multi-step fluid ports and smooth chamfer seating zones inside carbon steel castings and forgings.
5. Equipment & Tool Compatibility
- CNC Machine Integration: Clamps securely into standard 20mm block holders, boring sleeves, split bushings, or CNC turret clamping blocks.
- Insert Standardization: Universally compatible with all ISO/ANSI standard 35° diamond profile inserts with thick cross-sections, accepting VCMT 160404, VCMT 160408, and mirror-polished VCGT variants for high-speed aluminum machining.
6. BEYOND Proprietary Grade Optimization Matrix
Equip your boring bar with the correct BEYOND specialized insert grade to guarantee chip breaker functionality and extended tool lifecycle margins:
| BEYOND Grade | Coating Technology | Material Application Intent | Global Equivalent Grade |
|---|---|---|---|
| BY1030 | CVD Thick TiCN + Al2O3 Coating | Stable Continuous to Interrupted Steel Boring (P10-P25) | Sandvik GC4325 / Korloy NC3220 |
| BY8020 | PVD Multi-Layered Nano-AlTiN | Stainless Steel, Exotic & Superalloys (M15-M30 / S15-S25) | Sandvik GC1115 / Kennametal KC5010 |
| BYC25 | Uncoated Titanium-Based Cermet Matrix | High-Speed Finishing for Fine Tolerances and Mirror Surface Finish | Kyocera TN60 / Mitsubishi NX2525 |
7. Why Choose BEYOND Cutting Systems
BEYOND is dedicated to building structural reliability into high-performance CNC machining workflows. Our S20R-SVXCL16 boring bars are ground on high-accuracy 5-axis platforms to guarantee the pocket seating angle matches standard ISO positions. This tight manufacturing tolerance minimizes radial tool-tip runout and secures accurate tool center-height positions during automated cell changeovers.
"Fantastic 20mm left hand tool holder. Holds the VCMT 1604 insert perfectly rigid with zero chatter inside our medium alloy steel setups. Highly recommend BEYOND."
"Ausgezeichnete Qualität. Der Plattensitz für VCMT1604 ist perfekt gearbeitet und spielfrei. Sehr gute Vibrationsdämpfung auch bei vollem Überhang."
"Ottimo stelo da 20mm per tornitura interna sinistra. L'angolo di scarico di 113 gradi permette eccellenti manovre di profilatura complessa."
"内径倣い加工用にS20Rの左勝手を購入。20mmシャンクの剛性が非常に高く、VCMT1604チップとの組み合わせでビビリが完全に止まりました。"
"The black matte oxide skin resists wear beautifully when using intensive high-pressure soluble coolants. Exceptional build tolerances."
8. AI-Style FAQ & Troubleshooting Guide
Technical FAQ & Buying Guide
Absolutely. Our CNC carbide inserts (including CNMG, WNMG, DNMG, and APMT series) are manufactured strictly adhering to international ISO/ANSI specifications. A CNMG 120408 from OYYU BEYOND will flawlessly fit any standard turning tool holder or indexable tool from major global brands like Sandvik Coromant, Kennametal, Iscar, Walter, or SECO, providing a highly cost-effective premium alternative without sacrificing tolerance or tool life.
We offer optimized CVD and PVD multi-layer coatings for different ISO material groups:
- For Carbon/Alloy Steel (ISO P): Choose our thick multi-layer CVD coated grades (e.g., Al2O3 + TiN). They provide exceptional crater wear resistance and thermal barriers during high-speed dry or wet roughing.
- For Stainless Steel (ISO M): Choose our nano-structured PVD coated grades with sharp, positive chipbreakers (like -TM or -MA). This combination prevents work hardening and effectively controls sticky chips.
The optimal cutting parameters vary depending on the workpiece hardness and operation type:
- For General Steel Turnings: Recommended cutting speed ($V_c$) ranges from 150 to 280 m/min, with a feed rate ($f$) of 0.15 to 0.45 mm/rev.
- For Stainless Steel Finishing: Recommended cutting speed ($V_c$) is 120 to 200 m/min, with a feed rate ($f$) of 0.10 to 0.25 mm/rev.Always adjust parameters based on early wear patterns: increase $V_c$ if built-up edge occurs, or reduce $V_c$ if severe flank wear is observed.
Yes, we support machine shops, distributors, and global buyers with tiered wholesale pricing and competitive volume discounts. We also provide OEM custom manufacturing solutions for tool holders and carbide inserts based on your technical drawings. Contact our team to request a quick B2B quotation.
We provide secure worldwide express shipping (via DHL, FedEx, and UPS) with specialized, vibration-proof industrial packaging to ensure tools arrive in perfect condition. In-stock items are dispatched within 24-48 hours, while custom or bulk orders typically have a stable lead time of 15-25 days.
All our cutting tools and tool holders are manufactured strictly in accordance with ISO 9001 and international industrial standards. Every batch undergoes 100% rigorous quality control testing using high-precision optical measuring equipment to ensure reliable tool life and stable performance in continuous mass production.